For use with the AT-3726XL, AT-3716XL, AT-3714FXL,
AT-3726 and AT-3714F Switches
Version 3.1
PN 613-10773-00 Rev. C
Copyright 1998, 1999 Allied Telesyn International, Corp.
960 Stewart Drive Suite B, Sunnyvale CA 94086
All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesyn
International, Corp.
CentreCom is a regist ered trademark of Allied Telesyn International, Corp.
Netscape Navigator is a registered trademark of Netscape Communications Corporation. Ethernet is a registered trademark of
Xerox Corporation. All other product names, company names, logos or other designations mentioned herein are trademarks or
registered trademarks of their respective owners.
Allied Telesyn International, Corp. reserves the right to make changes in specifications and other information contained in this
document without prior written notice. The information provided herein is subject to change without notice. In no event shall
Allied Telesyn International, Corp. be liable for any incidental, special, indirect, or consequential damages whatsoever, including
but not limited to lost profits, arising out of or related to this manual or the information contained herein, even if Allied Telesyn
International, Corp. has been advised of, known, or should have known, the possibility of such damages.
Purpose of This Guide .................................. ............................. ......................................................................Preface-i
How This Guide is Organized .....................................................................................................................Preface-ii
Related Guides ...................................... ............................. .............................................................................Preface-vi
Chapter 1
Features, Menu Tree, and Defaults ......................................................................... .......................................1-1
Software Features ...................................................... ............................. .......................................................... ..........1-1
Switch Naming and Security Features.............................................................. ............................. ............... 1-3
Menu Tree ..... ............................. ............................. ............................. ................................................ ..........................1-6
Chapter 2
Getting Started with Local and Remote Omega ......................................................................................2-1
Getting Started with Local Omega .......................................................................................................................2-1
Configuring Your Terminal Emulator Program......................................................................................... 2-1
Starting an Omega Session............................................................... ................................................................ 2-2
Entering an IP Address.............................................................................................................. ......................... 2-3
Quitting a Session................................... ............................................................................................................. 2-3
Managing Your Switch in a TCP/IP-based Network .......................... ............................. .................................2-4
TCP/IP with BootP or DHCP........................................................................................ ...................................... 2-4
TCP/IP without BootP......... ................................................................................................................................ 2-5
Starting a Browser Sessio n ................................ ............................. ............................. ...................................... .......3-2
Navigating Around the Switch ..................... ............................. ............................. ................................................3-3
Chapter 4
Configuration an d Administration ................................................................................................................4-1
Connecting to a Remote System ........................... ............................. ...................................................................4-3
Pinging a Remote System ............................................................................................................................ ............4-4
Enabling or Disabling a Port ............................. ............................. ....................................................... ...................4-5
Configuring IP Parameters ................... ....................................................................................................................4-6
Naming the Switch ............................................................................... ...................................................... ................4-8
Change/Delete the Switch Name...................... ......................................................................................... 4-10
Naming the Port ... ............................. ............................. ............................. .............................................................4-11
Changing or Deleting a Port Name................................................................................ ............................ 4-13
Assigning a Password to the Switch ................................. ............................. ............................. ......................4-14
Forgetting Your Password................................. ............................. ............................. ................... ............... 4-14
Enabling Store-and-forward or Cut-through (Fragment-Free) ......................................................... ...... 4-15
Setting Up a VT100 ..................................................................................... .............................................................4-19
Setting Up a Generic (Dumb) Terminal..................................................................................................... 4-19
Setting Time Out Protection ................................... .............................................................................................4-21
Deleting a Previously Configured Time out Valu e................................................................................. 4-21
Local Omega....................................................................................................................................................... 4-22
Performing Software Upgrades Via TFTP ........................................................................................................4-24
Conditions for Network Downloads via TFTP.......................................................................... ............... 4-24
Using TFTP........................................................................................................................................................... 4-24
Downloading from One Switch to Another................................................................... ......................... 4-25
Broadcast Updated Software to All Systems.......................................................................................... 4-26
Using XModem to Download.................................................................................. ..................................... 4-27
Configuring for Bridging ................................... ............................. ............................. ..........................................4-28
Configuring Spanning Tree Parameters................................................................................................... 4-29
Designating the Root Port............. ............................. ............................. ............................. ......................... 4-31
Selecting Global Configuration ........................... ............................. ...................................................................4-33
Enabling/Disabling Port Trunking ........................................................................ .............................................4-34
iv
AT-S20 User’s Guide
Chapter 5
Virtual LAN Configuration ..................................................................................................................................5-1
Port Information................................................................................................................................................... 5-5
Adding a New VLAN............................................................................................................................................ 5-7
Port to VLAN Configuration.............................................................................................................................. 5-9
Deleting a Port from a VLAN or Changing Port’s VLAN Assignm ent.............................................. 5-10
MAC Address Table ..................................................................................................................................... ................6-3
Show All MAC Addresses................................................................................................................................ ... 6-4
Show By Port MAC Addresses........................................................................................................... ............... 6-4
Get Port from MAC Address............................................................. ............................. ................................... 6-5
Static MAC Addresses ................................................................................................................................................6-6
Show All Static MAC Addresses.... ............................. ...................................................................................... 6-6
Show Per Port Static MAC Addresses............................................................................................................ 6-7
Delete/Add Static MAC Address..................................................................................................................... 6 -8
Add/Delete Static MAC Addresses and Selecting Ports for Multicasts............................................. 6-9
Clearing Static MAC Table.............................................. ................................................................................ 6-11
Locating Your Switch’s MAC Address........................................................................................................ 6-11
Mirror Port ...................................................................................................................................................................6-23
Port Status ...................................................................................................................................................................6-25
Port Numbering ............................. ....................................................................................................... ....................6-26
Statistics: Received and Transmitted Ethernet Frames ...............................................................................6-28
Viewing Port Statistics........................................................... ............................. ............................................. 6-33
Interpreting the Graphs.................................................................................................................................. 6-34
Using the Graphs as a Monitoring and Diagnostics Tool................................................................... 6-35
Resetting the Switch ..................................................................................................................................................7-2
To Reset the Switch.................................................................................... ......................................................... 7-2
Getting Help ................. ................................................................................................................. ................................7-4
To Reset Switch (System) Counters............................................................................................................... 7-5
AppendixA
Spanning Tree Protocol ......................................................................................................................................A-1
The purpose of this guide is to instruct network administrators on
how to manage their switch by using the Omega management
software to configure and monitor the device. By using the Omega
software, a network administrator can manage the switch in several
ways:
❑
Remotely
❑
Locally
❑
Web-based
Network administrators should be familiar with Ethernet switches,
bridging, and the spanning tree protoc ol.
Preface-i
How This Guide is Organized
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This guide is composed of the following sections:
Chapter1, Features, Menu Tree, and Defaults, which presents the
major switch features, a menu tree that displays the primary and
secondary menus, and a list of switch defaults in tabular form.
Chapter2, Getting Started with Local and Remote Omega, provides
instructions on how to set up the switch for remotely or locally
managing the switch.
Chapter3, Getting Started With Browser Management, provides
instructions on how to use a browser to manage the switch.
Chapter4, Configuration and Administration, describes the
management tasks according to switch, configuration, port
configuration and administration.
Chapter5, Virtual LAN Configuration, provides a brief discussion of
Allied T elesyn’s implementation of VLANs.
Chapter6, Monitoring, describes the tasks related to monitoring the
switch.
Chapter7, Diagnostics, describes the testing procedures using the
Omega menus.
AppendixA, Spanning Tree Protocol, provides a brief explanation of
Spanning Tree Algorithm and its use with the switch
At the end of this guide is an Index according to subject matter.
Preface-ii
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The conventions used in this guide are as follows:
To select an optionHighlight the option by pressing the Up
AT-S20 User’s Guide
❑
For DEC VT100 or ANSI (the default) terminal configuration:
When directedYou must
(↑) or Down (↓) arrow key; then press
RETURN
or
Type the first character of the option you
want at the prompt and then press
RETURN.
If two or more options have matching
initial characters, type the first characters
enough times until the option you want
is highlighted; then press RETURN.
To enter information, for
example, IP address
To return to the previous
Type the correct IP address and press
RETURN
Select the option
screen (Omega only)
or
Press ESC
To return to the previous
Select the Back button
screen (Browser)
To return to Main Menu
(Omega)
To return to Main Menu
Highlight Return to Main menu... and
then press RETURN
Select the Main Menu icon.
(Browser)
All procedures in this guide are based on the default terminal
configuration.
Preface-iii
Document Conventions
❑
For generic (dumb terminal) terminal configuration:
When directedYou must
To select an optionType the first character of the option you
want and then press RETURN.
If two or more options hav e mat ching initial
characters, type enough characters for
Omega to distinguish your choice from the
other options; then press RETURN. To guide
you, the characters you must type are in
uppercase.
For example:
Mirroring configu ration
MAC Address Table
If options on a list are preceded by numbers
(1:, 2:, 3:, etc.), type the number
corresponding to your choic e a t the pr o mpt;
then press RETURN.
To enter information,
for example, IP
address
To return to the
previous screen
❑
Selecting a configuration:
Omega denotes a def ault configur ation by preced ing it with a
>. For example, DEC VT100 configuration is shown to be the
terminal type in the following screen:
> VT100-compatible / ANSI
Generic dumb terminal
Type the correct IP address at the prompt
and press RETURN.
Press RETURN after making an entry.
Preface-iv
AT-S20 User’s Guide
Warning
Caution
VT100-compatible / ANSI
> Generic dumb terminal
The default selection in a DEC VT100 terminal configuration
also appears darker. If you change the option, Omega changes
the user interface by moving the > to the new selection. For
example:
❑
Selecting menu options:
Menus and submenus are in courier type. Menu hierarchies
are separated by a >.
Menu:
Menu:
❑
Entering variables:
Administration
Administration>IP parameters
Variables are information you must supply, as in IP addresses,
MAC addresses, or port numbers. Variables are enclosed in
angle brackets (<>).
For example, to configure a specific port:
Select
Port status and
configuration><PortNumber>
where
<PortNumber>
can be Port 1, or 2, and so on.
Note
A note provides additional information.
A warning informs you that performing or omitting a specific action
may result to bodily injury.
A caution informs you that performing or omitting a specific action
may result to equipment damage or loss of data.
Preface-v
Related Guides
5HODWHG#*XLGHV
Allied Telesyn wants our customers to be well informed b y pr ov iding
the most up- t o- date and easily ac c ess ib le g uid e s an d othe r te c hn ical
information.
Visit our website at: www.alliedtelesyn.com and download the
following guide:
The switches have the following major software management
features:
❑
Supports industry-standard 802.1Q VLAN tagging and
supports a maximum of 32 port-based and tag-based VLANs
(XL versions only)
❑
Security (XL versions only)
❑
Backpressure (XL versions only) and transmit pacing provide
one-way flow control to relieve congested networks
❑
Port mirroring
❑
Firmware is factory-installed and ready to use
❑
User configuration for store-and-forward and cut-through
packet switching for non-XL versions; store and forward only
for XL versions
❑
Auto-negotiation on 10 Mbps and 10/100 Mbps UTP ports in
compliance with IEEE 802.3u
❑
Mulitcast address support which allows users to specify the
recipient port for multicast packets
❑
All UTP and fiber ports are software configurable for full- and
half-duplex
❑
Port B (optional uplink) can be configured as either a 10/100
Mbps UTP or a 100 Mbps fiber uplink
1-1
Software Features
❑
Port Trunking allows configuring of Ports A and B to function
as a single uplink port which effectively increases the
throughput of the connection.
❑
Spanning Tree Protocol (STP) support
❑
System configuration, management, and diagnostics using
Allied Telesyn’s
Omega interface
, accessible locally via an
RS232 asynchronous terminal port, remotely via Telnet, or a
web browser.
❑
Software upgrades using Xmodem via the RS232 port or TFTP
to download software to switches on the network
❑
Broadcast software from a switch to one or all switches on the
network
❑
Web-based management
❑
SNMP agent that allows the switch management from the
user’s network management station
❑
Support for BootP and Dynamic Host Configuration Protocol
(DHCP) for IP parameters
❑
Support for DEC VT100/ANSI (the default), or generic (dumb)
terminal configuration
❑
Internet Control Message Protocol (ICMP) Echo PING support
❑
Domain name service support (DNS)
1-2
AT-S20 User’s Guide
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The switch provides configurable options for customizing for
example,
❑
Naming the switch and its ports
Names are more descriptive and easier to remember than
addresses.
Port names can be associated with the user assigned to the
port or an office location. The need to use symbolic names
becomes more apparent as you add more switches and
therefore multiply the number of ports you must manage.
❑
Enabling security features
Although passwords are not required to access the
management menus, with the Omega Options menu, you can
prevent (disable) either Local Omega, Remote Omega, or webbased Omega, create password protection, and enable
timeout.
A timeout value automatically terminates a management
session after a given period when someone leaves a current
session unattended.
1-3
Switch Default Settings
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Table 1-1 lists the switch default settings.
Table 1-1
Switch Default Settings
SettingsDefault
IP Address0.0.0.0
Subnet Mask0.0.0.0
Gateway Address0.0.0.0
Get community stringpublic
Set community stringprivate
Trap community stringpublic
Port mirroring st ateDisabled
Spanning Tree ProtocolDisabled
Omega AccessEnabled
System NameNone
Password (Omega)No password assig n ed
Download PasswordATS20
Port Priority128
Port Path Cost100 (AT-3726)
Auto-negotiate, Full-duplex or Half-duplex (per port)Auto-negotiate (AT-3726XL,AT-3726,
AT-3716XL)
Half-duplex (AT-3714FXL, AT-3714F)
Spanning Tree Priority32768
Maximum Aging Time20 seconds
Forwarding Delay15
Hello Time2 seconds
Transmit Pacing/BackpressureDisabled
Bridge Identifier (STP)32768 (bridge priority)
Port Priority (STP)128
Port Cost (STP)100 for 10 Mbps ports
To set your switch to the factory defaults, do the following:
This operation deletes existing switch configurations.
1. Attach a terminal or PC to the RS232 port located on the front
2. Press RESET located on the right side of the switch’s front panel.
AT-S20 User’s Guide
panel of the switch and start the terminal emulation program.
3. Immediately press any key when you see
diagnostics or to reload system software
Hit any key to run
.
A menu
then displays.
4. Select D from the menu. The following warning message displays:
WARNING: This will erase all current
configuration data!
Continue? Y/N
5. Select Y.
The system displays:
been reset to factory default values
All configuration data has
.
6. Press B to boot the switch software.
1-5
Menu Tree
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The following illustration shows the Omega Menu tree.
Port status and
configuration
Enable this port
Disable (partition) this port
Auto negotiate
Full duplex
Half duplex
Store-and-forward
Cut-through
Transmit pacing enable
No transmit pacing
Global config
Port name
(fragment-free)1
Ethernet statistics
Receive Good Frames
Filtered Frames
Broadcasts
Multicasts
CRC Errors
Alignment Errors
Undersized Frames
Fragments
Long Frames
Transmit Statistics
Individual port overview
Administration
Update software in
another sytem
Broadcast updated
software to all systems
XModem software update
to this system
Connect to a remote
system
Ping a remote system
Activity monitor
Diagnostics
Reset and restart the
system
System
Configuration
System name
Default VLAN Aging Time
Omega Options
IP Parameters
Security/Source
Address T able
Terminal configuration
Back pressure
Port T runking
2
2
1. For non-XL versions only
2. For XL versions only
RMON Statistics
Port RMON Statistics
Zero all statistics counters
on the entire system
Figure1-1
Omega Menu Tree (1 of 2)
1-6
AT-S20 User’s Guide
Traffic/Port
Mirroring
Enabled
Disabled
3. For XL versions only
Virtual LAN
Virtual LAN definitions
Port to VLAN
configuration
3
Bridge
Figure1-2
Spanning tree parameters
Port spanning tree
configuration
Omega Menu Tree (2 of 2)
MAC Address
Show all MAC addresses
By port MAC addresses
Get Port From MAC
Address
All static MAC addresses
Per port static MAC
addresses
Multicast addresses
Clear static MAC table
1-7
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To locally managing your switch, simply connect a terminal or PC
directly to the switch’s RS232 port to access the Omega menus. See
the following sections.
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To set the terminal emulator program, do the following:
1. Access the terminal emulator program on your PC (VT100) and set
the following:
❑
Data bits to 8
❑
Stop bits to 1
❑
Parity to None
❑
Full-duplex (using straight-through cable)
❑
Autobaud
Note
The diagnostics that run during the system boot output only at 9600
bps. Therefore, Allied Telesyn recommends this speed setting.
2. Press <Return> several times to ensure baud autoconfiguration.
2-1
Getting Started with Local Omega
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Once you have established a connection to the switch, the Omega
Main Menu displays.
The banner reflects the name of your switch. This example shows
that the AT-3714FXL switch is operating and the switch name is
Accounting.
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from the main menu, the
By selecting
Figure 2-1
System Configuration
following screen displays. The default settings are always in bold
print on the screen.
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2-2
AT-S20 User’s Guide
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If you have a T CP/IP network but do not ha v e a BootP server, or DHCP
server, you must enter an IP address and subnet mask for the switch
through Omega.
1. Select
System administration IP Parameters
from the
Main Menu.
2. Select
3. Select
4. Select
IP address
Subnet mask
and enter a unique IP address for the switch.
and enter the switch’s subnet mask.
Gateway address
and enter the address if you are
sending packets to another IP network. The gateway address is
the router that can forward packets to the other IP networks.
Once the switch has an IP address, you may initiate Omega sessions
to it via Telnet. Note that you can only have one Telnet session
operating at any one time. The session can be either inbound or
outbound. If you have an inbound session to Omega, you do not
have the option of starting a new session (outbound connection).
Therefore, if you are already using Telnet, the Omega option
Connect to a remote system
will not be available (described
in detail in Chapter 4, Connecting to a Remote System on page 4-
3). In addition, a local RS232 connection blocks a Telnet session and
vice versa.
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Note
For non-IP environments, you can use MAC addresses to connect to
remote Allied Telesyn switches only if there are no routers between
the two switches. If you have assigned unique names, you may use
these also.
Select
accessed the switch through the network, selecting
Quit
from the Main Menu to terminate the session. If you
Quit
also cuts
the connection.
It is important to select
Quit
when you are done with Omega;
otherwise, you may block other remote sessions, local sessions, or
software downloads. To avoid possible lockouts, see Setting Time Out Protect i o n on page 4-21.
Note
After you have configured your switch using the Omega
management software, you must quit the session and disconnect the
RS232 cable.
2-3
Remote Management Requirements
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Y ou can remotely manage your switch, but first you must have one of
the following:
❑
The switch’s pre-configured MAC address (located below the
RS232 Terminal Port label on the switch’s front panel
❑
A unique IP address if you use TCP/IP (by either assigning one
to the remote switch or by having your BootP/DHCP server
provide the needed parameters
❑
A unique name for the switch that you assign via Omega (see
Naming the Switch on page 4-8.
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To manage the switch in a TCP/IP based network, you must first:
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❑
Configure the switch’s IP parameters, or
❑
Automatically get an IP address via BootP or DHCP
Note
You do have the option to manage the switch using either SNMP or
Omega Remote, via Telnet or web browser.
The function of the BootP utility within an IP server is to enter an IP
address into the switch. Whenever you reset or power on/off the
switch, the switch transmits a request packet to the server every
three seconds to obtain the required IP parameters. (The BootP
utility and the DHCP both make three attempts each.)
If the requesting switch does not receive a BootP or DHCP response
after the third request, it will operate with a computed pseudo IP
address based on the switch’s MAC address for Allied Telesyn switchto-switch communication, i.e., downloads.
If the switch receives a BootP or DHCP response, it extracts the IP
address, Subnet Mask, and Gateway/Router address from the
response packet and uses these parameters to configure itself until
the next power-on or reset. Additionally, if the BootP response
packet specifies a filename and a TFTP host address, then the switch
sends a TFTP “get” request to the specified host using the specified
filename. This initiates a TFTP download of operating software and
allows you to maintain the downloaded server software.
2-4
AT-S20 User’s Guide
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To manage the switch using SNMP, Telnet or web browser, you must
at least enter the IP address and subnet mask using the Omega
menus.
T o manage your switch on a non-TCP/IP network, you need to locally
connect to one switch in the segment (see Configuration Options
on page 2-5). You can then connect to other segments on the same
segment using the techniques described in Chapter 4, Connecting to a Remote System.
Note
You cannot manage the switch using a web browser without
configuring TCP /IP information.
Network administrators can use the configurable options for their
individualized switch performance. For example:
❑
Name the switch and its ports
Names are more descriptive and easier to remember than
addresses.
Port names can be associated with the user assigned to the
port or an office location. The need to use symbolic names
becomes more apparent as you add more switches and
therefore multiply the number of ports you must manage.
❑
Enable security features
Although passwords are not required to access the
management menus, with the Omega Options Menu, you can
prevent (disable) either Local Omega, Remote Omega, or webbased Omega, create password protection, and enable
timeout.
A timeout value automatically terminates a management
session after a given period when someone leaves a current
session unattended.
Proceed to Chapter4, Configura t io n an d Admi n is tr at i o n and
Chapter 6, Monitoring.
2-5
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To use AT-S20 software via a browser, you need the following:
❑
A computer connected to any network port
❑
A Web browser, such as Netscape Navigator®, installed on the
computer
❑
The IP address of the switch (see Chapter2, Confi guration
Options)
Note
While only one local or remote Omega session can be opened, there
can be multiple web-based sessions opened at any time.
3-1
Starting a Browser Session
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To access the switch using your browser, do the following:
1. If your network is using a proxy server, you will need to make
exceptions for the switches that you want to manage. Refer to the
documentation provided with your web browser.
At minimum, you must have Netscape version 3.0 or any other
industry-standard browser to manage the switch via a browser.
2. At the Universal Resource Locator (URL) prompt, enter the
switch’s IP address. The following screen is displayed.
Note
3-2
Note
For easy access, you may want to bookmark the URL for the switches
you access frequently.
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The switch’s front panel is active. You can click anywhere on the
switch and a menu or table displays. For example, if you click Port 15,
that port’s settings appear, as shown in Figure3-1.
AT-S20 User’s Guide
Figure3-1
Port 15 Sett ings
3-3
Navigating Around the Switch
If you click any other area other than a specified port on the switch’s
front panel, the following table displays.
Figure3-2
Port Link, Status, and Mode States
You also can click on the Omega Main Menu.
You are now ready to configure your switch. See Chapter 4,
Configuration and Administ ratio n .
3-4
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